I'll bet these look good, and with the lenses on you probably can't even tell they're LEDs. I've noticed that the Superior bullet lights never looked very bright (at least on tv, I don't recall ever seeing a Superior ambulance with bullets lit up in person). Unless it was night-time, or a really gloomy day, you couldn't really see if they were even illuminated with the old-style bulbs just because they were so dim, and I think the bullets dispersed the light somehow making them not nearly as bright as simple tunnel lenses.
I am guessing that Superior sourced their bullet lenses from 59 Cadillacs from their local Cadillac dealer's parts department.